Sungrow SG33CX User Manual

2 Product Introduction User Manual
8
2.2.5 DC Switch
The DC switch is used to disconnect the DC current safely whenever
necessary.
The SG33CX is equipped with one DC switch to control the connection and
disconnection of all DC terminals.
The SG40CX and SG50CX are equipped with two DC switches separately
controlling a group of DC inputs. The correspondence is as follows:
(SG40CX) (SG50CX)
2.3 Circuit Diagram
The MPPT is utilized for DC input to ensure the maximum power from the PV
array at different PV input conditions. The inversion circuit converts the DC
power into AC power and feeds the AC power into the utility grid through the AC
terminal. The protection circuit is equipped to ensure the safe operation of the
device and personal safety.
Fig. 2-3 shows the main circuit of the inverter.
L1
PE
L2
L3
AC SPD
DC1
DC switch
DC Bus
Inverter Circuit
(DC/AC)
AC
Relays
DC
n
Current
Monitoring
MPPT
(
Boost 1
)
DC EMI
Filter
DC SPD
N
*SG33/40/50CX: n= 3/4/5
MPPT
(
Boost 2
)
AC
Filter
AC EMI
Filter
Fig. 2-3 Circuit diagram

Sungrow SG33CX Specifications

General

Model	SG33CX
Manufacturer	Sungrow
Rated Power	33 kW
Max DC Voltage	1100 V
Max Efficiency	98.7%
Start Voltage	200 V
Total Harmonic Distortion	< 3%
Power Factor at Rated Power	1
DC Connection Type	MC4
Allowable Relative Humidity Range	0 - 100%
Operating Altitude	4000 m
MPPT Voltage Range	200 V - 1000 V
AC Voltage Range	310 V - 480 V
Rated Grid Frequency	50 Hz / 60 Hz
Adjustable Power Factor Range	0.8 leading to 0.8 lagging
Operating Ambient Temperature Range	-25 °C ... +60 °C
Communication	RS485